Ticket #151 (new defect)

Opened 15 years ago

_ pattern succeeds on end of input?

Reported by: pnkfelix@… Owned by: kazzmir
Priority: major Milestone:
Component: kazzmir/peg.plt Keywords:
Cc: Version:
Racket Version: 4.1.4


The behavior below does not seem to agree with Bryan Ford's POPL '04 paper:

#lang scheme
(require (planet kazzmir/peg:2:0/peg))
(parse (peg (start s) (grammar (s ((_) $)))) "a")
(parse (peg (start s) (grammar (s ((_ _) $)))) "a")

produces the output:

Welcome to DrScheme, version 4.1.4 [3m].
Language: Module; memory limit: 128 megabytes.

I would have expected #f for that last output.

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